update regex to find energyplus with dots

@macumber I know that we are talking about a better way to handle this, but for now, can you allow `.` in the find_energyplus path?

Note that EnergyPlus 8.2 installer does use dashes, I just override them to follow the dot convention.

```
root@d90a48a16aca:/usr/local# ls -alt
total 532
drwxr-xr-x  2 root root   4096 Oct  3 01:02 bin
drwxr-xr-x 22 root root   4096 Oct  3 01:02 .
drwxr-xr-x  9 root root   4096 Oct  3 01:02 EnergyPlus-8.2.0
drwxr-xr-x  9 root root   4096 Oct  3 00:46 EnergyPlus-8.1.0
```